The European Union is preparing “countermeasures” against the United States if the two sides cannot reach a deal after surprise U.S. tariffs on steel rattled global markets and complicated the ongoing negotiations between Brussels and Washington.

The European Commission said on Monday it would make a strong case this week for the United States to reduce or eliminate tariffs even after Donald Trump said he would double import duties on steel and aluminium to 50%.

Officials from the European Union and the United States will start a new negotiating push, after President Trump delayed until July 9 tariffs of 50 percent.